Antioffset mechanism for printing presses



A n I ug I R. J. GREENWAY ANTI-OFFSET MECHANISM FOR PRINTING PRESSESFiled March 5} 1925 ATTORNEYS Patented Aug. 9, 1927. I

UNITED STATES PATENT OFFICE.

RICHARD GREENWAY, ,OF WESTERLY, RHODE ISLAND, ASSIGNOR TO 0. B. COTTRELL'& SONS COMPANY, OF STONINGTON, CONNECTICUT, A CORPORATION OI DELA- wannANTIOFFSIiZT MECHANISM FOR PRINTING PRFSS ES.

Applleation flled March 3, 1925. Serial No. 12.842.

The object .of-my invention is to provide certain improvements in theconstruc- 18 the freshly printed side of the sheet or web;.

said-elements including a traveling endless .belt arranged for contact(preferably ex-' tended contact) with the sheet or web while on itscarrier, means being employed for applying the anti-offset powder inregulable quantities to the endless belt for transfer.

thereby onto the freshly printed side of the sheet or web. I

' A practical embodiment of my invention is represented in theaccompanying drawin s, in which ig. 1 represents in side elevation somuch of a printing press as includes my improved anti-offset mechanism.

Fig. 2 represents a longitudinal vertical section through the same.

The rotary carrier is herein shown as a sheet carrying cylinder 1,provided with sheet grippers 2, the shaft 3 of which cylinder issuitably mounted in the frame 4.

The endless belt 5 passes around the drive roll 6, the idler roll 7 andthe belt tightener roll 8 and underneath thebfl'set powder applying roll9. These rolls are all suitably mounted in the frame 4 and the rolls 7and 8 are so arranged as to cause'the endless belt 5 to have an extendedcontact with the freshly printed side of the sheet on the carrier.

The anti-oflset'powder supply fountain is denoted by 10 and its roll 11is arranged in position to transfer the anti-offset powder to the roll9, which latter roll is provided with a cover of fabric, such, forinstance as felt, pile fabric and the like.

An adjustable doctor knife 12 is mounted 'in the fountain 10 impositionto regulate the printed side of the amountof anti-offset powder Jtaken bthe fountain roll 11 for transfer to the, abr ic covered roll 9.Thisroll 9 applies the antiinvention; hence, I

15, 16 and 17 leading from thecarrier gear Itwill be seen that by thisarrangementl am enabled toiapply the anti-offset owder.

to the, freshly, printed side of the s eet or web in regulablequantities so that all waste of the powder may be eliminated and also sothat too much powder need not be applied to llthe'freshly printed sideof the sheet or we It is evident that various changes. may be resortedto in the constructiom'form and arrangement of the several arts withoutdeparting from the s irit' an scope of my 0 not intend to limit myselfto the particular embodiment hereinshown and described but What I claim'is: I 1. A rotary carrier for a freshly printed sheet or web, atraveling endless belt arranged freshly printed outer side oft e sheetor web.

sheet or' web, a-- traveling endless belt arwhi e on the carrier, and afabric'covered roll for applying anti-offset powderto the 3. A rotarycarrier for a freshly printed ran edifor contact with the'sheet orwebbelt for transfer thereby onto-the freshly printed outer side of thesheet or web, the

carrier, belt and roll being driven at the. I

same surface speed. r

4'. A rotary carrier-for a freshlyprinted sheet or web, a travelingendless belt arranged for extended contact with the sheet orweb'whilexon the carrier, and a fabric covered roll for applyinganti-offset powder to the belt for transfer thereby onto the freshly.printed outer side of the sheet or web,-the carrier, belt and roll beingdriven' at the same surface speed.

5, 'A rotary'carrier-for a freshly printed sheet or web, atraveling'endless belt arranged for contact with the sheet or web whileon the carrier, an anti-offset powder supply fountain, afountain roll,and afabric covered roll engaged thereby for applying the anti-ofi'setpowder to the belt for transfer thereby onto the freshly printed outerside of the sheet or web.

6. A rotary carrier for a freshly printed sheet or web, a travelingendless belt arranged for extended contact with the sheet or web whileon the carrier, an anti-offset powder supply fountain, a fountain roll,and

a fabric covered roll engaged thereby for applying the anti-offsetpowder to'the belt 'for transfer thereby onto the freshly printed outerside of the sheet or web.

7 A rotary carrier for a freshly printed sheet or web, a travelingendless belt arranged for contact with the sheet orweb while on thecarrier, an anti-offset powdersupply fountain, a fountain roll,and afaba fabric covered roll engaged thereby for applying the anti-offsetpowder to the belt for transfer thereby onto the freshly printed outerside of the sheet or web, the carrier, belt and rolls being driven atthe same surface speed.

In testimony, that I claim thevforegoing as my invention, I have signedmy name this 27th day of February, A. D. 1925.

RICHARD J. GREENWAY.

